CALCRUST NORTH: Tectonics of the California Coast Ranges in the San Francisco Bay Area

北钙壳：旧金山湾区加利福尼亚海岸山脉的构造

• 批准号: 9117994
• 负责人: Thomas McEvilly
• 金额: $ 38.81万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-06-01 至 1995-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117994&HistoricalAwards=false
• 关键词: CALCRUST; NORTH; Tectonics; California; Coast

This research program is an investigation of the present crustal tectonics and the evolution of the central California coast ranges in the San Francisco Bay region, where the San Andreas fault system splays eastward through a complex of successive bifurcations into the Calaveras, Hayward and Greenville faults, a process readily visible in the seismicity maps of the area. Competing hypotheses for crustal accommodation of the plate boundary motion will be tested. Evidence will be sought on the compelling modern paradigm for the crustal dynamics of this system, in which upper crustal blocks along with their bounding faults move eastward, above a mid-crustal decollement, creating the regional complex of east- and west-vergent thrust faults, tectonic wedges and fold belts. The proposed research is an integrated investigation of the crust's third dimension eastward from San Francisco Bay to the western boundary of the Great Valley. Modern seismological methods and geological/geodetic constraints will be combined in the study. Reflection seismic profiles, natural-event P- and S-wave tomography, ongoing geological studies of East Bay faults, and new data on crustal deformation in the Bay Area will be interpreted jointly within a common geometrical framework for the plate boundary in central California. Reflection data are key to this study, and a primary focus in this project. 160 km of high- quality industry "spec" data in the area are available for purchase and can be reprocessed for deeper imaging. The new BASIX (Bay Area Seismic Imaging eXperiment) marine/land profile, shot in the Bay, River and offshore waters with USGS support in September 1991, provides additional valuable coverage of the region, and the data are in hand at Berkeley.

这项研究计划是对目前 地壳构造与加州中部海岸的演化 位于旧金山弗朗西斯科湾地区， 系统通过一系列连续的分叉向东扩展 进入卡拉维拉斯、海沃德和格林维尔断层， 在该地区的地震活动图上很容易看到。 竞争 板块边界运动的地壳调节假说 会得到考验 我们将寻求令人信服的现代证据， 该系统的地壳动力学的范例，其中上部 地壳块体沿着其边界断层向东移动， 在中地壳滑脱之上，形成了 东西向逆冲断层、构造楔和褶皱 皮带. 拟议的研究是一个综合调查的 地壳的第三个维度向东从旧金山弗朗西斯科湾到 大峡谷的西部边界。 现代地震学方法 和地质/大地测量的限制因素。 反射地震剖面，自然事件P波和S波 断层扫描，正在进行的东湾断层地质研究，以及新的 将解释海湾地区的地壳变形数据 共同地位于板的共同几何框架内 位于加州中部的边界。 反射数据是关键 研究，也是这个项目的重点。 160公里高- 该地区的优质行业“规格”数据可供购买 并且可以被再处理用于更深的成像。 新的BASIX（湾区 地震成像实验）海洋/陆地剖面，在海湾拍摄， 1991年9月，在美国地质勘探局的支持下， 为该地区提供了额外的有价值的覆盖范围， 都在伯克利